Cable Reference Guide - Audio Intervisual Design, Inc.

AppendixRegeneration or Jam SyncJam Sync, is a generator function that is a better alternative toreshaping. It is used to create a new time code that is related toan existing time code on tape. It is extremely useful for repairinga break in an existing time code track, or creating a continuoustime code track from an edited or discontinuous track. Code isread up to the last “good” address. Then the generator uses thenext consecutive address to generate new code.ATR (VTR)LYNX MODULETC IN12 35 08 29READERTIME CODEVALUE12 35 08 29GENERATORJAM SYNCGEN OUTSMPTE008AFigure Appendix A-9. Jam SyncAbout Time Code ReadersSynchronizer EssentialsJam sync is used extensively in video editing; where differentpieces of tape, each with different time code, are spliced together.Jam sync provides the resulting program with continuous timecode. TimeLine’s Micro Lynx and Lynx both have manual andautomatic jam modes, that quickly and simply let you repair orcreate new time code tracks to overcome the problems that aredetected with bad code.A Wide Band Reader, such as the Lynx Time Code Module orMicro Lynx, reads time code even at the high tape speeds used forFast Forward and Rewind. Wide band reader capabilities areessential, since SMPTE addresses provide the only accuratemeans of locating positions on tape.If time code on tape becomes unreadable, the TimeLine readersautomatically search for the next best sync source on tape. AfterSMPTE, the reader searches for serial time code, then pilot tone,and finally tach pulses that are derived from the rotation of thetape machine’s capstan motor.A synchronizer reads time code from two or more machines; thenby manipulating the speed of each machine’s capstan, it forces thetwo machines to play tape at the same speed. This process iscalled locking. The Micro Lynx system offers the followingsynchronization mode.Micro LynxA-16 06/22/00